Patent GB-817273-A (GB)
Title: Improvements in throttle control mechanisms for motor vehicles
IPC: F02D9/00
Filed: 1954-12-17
Abstract: 817,273. Regulating. HUMBER Ltd., BROWN, R. H., and BATTEN, J. D. Dec. 16, 1955 [Dec. 17, 1954], No. 36661/54. Class 7(6) [Also in Group XXIV] A throttle control linkage has included therein a contractible device 122, Fig. 6, arranged so that when operated it causes closing of the throttle regardless of the position of the accelerator pedal 22, Fig. 1, the device including valve means which arrests operation thereof when the throttle reaches the closed or nearly closed position. The accelerator pedal 22 is connected by a link 114 to a spindle 100, Fig. 6, connected by a lever arm 114 and link 113, to one end 116, Fig. 8, of a suction operated spring-loaded bellows 110 the opposite end 119 of which forms a cylinder 111 for a spring-loaded piston 128 having an extension 130 connected to a lever arm 118 on a spindle 102 connected by linkage 101, Fig. 1, to the throttle valve 24. During normal operation of the throttle valve by the accelerator pedal the bellows 110 and piston device 128 slide as a unit along a tube 112 to transmit movement directly from the linkage 114 to linkage 101, the unit moving from left to right from the throttle closed position of Fig. 6, in which the parts 114, 113, are nearly in alignment so that relatively large movements of pedal 22 produce only small movements of the throttle valve to the throttle open position of Fig. 8 in which the parts 114, 113, are about at right angles. During gear changing a manually operated switch associated with the gear change lever e.g. as described in Specification 619,223 [Group XXIV] is closed to lift a solenoid operated valve 50, Figs. 1 and 3, whereby a suction reservoir 59 is connected to a passage 62 leading to a suction-operated clutch disengaging device and to a passage 64 leading through a passage 112b, Fig. 8, in the link 112 and ports 141, 122, to the interior of bellows 110 which is thereupon collapsed, causing the end plate 119 to move to the left in the throttle closing direction until a spindle extension 121 thereof abuts a stop 127, Fig. 9, in which position the ports 141 are closed by a sleeve 137 and the throttle has been moved to the closed or nearly closed position regardless of the position of the accelerator pedal. If, during gear changing, the clutch driven member 72, Fig. 1, over-runs the driving member 73, contacts 70, 71, are closed to lift a second solenoid operated valve 51 to connect the suction reservoir 59 to a passage 66 leading through a passage 112a, Fig. 8, and ports 133, 132, to the cylinder 111 whereby the cylinder 128 is moved to the right, as shown in the bottom half of Fig. 9, to reopen the throtle valve to a pre-set position to obtain synchronisation of the driving and driven shafts. When gear changing is complete the valves 50, 51, return to their original positions whereby the passages 62, 64 ,66 are connected to atmosphere through a passage 56, Fig. 3. The clutch is therefore re-engaged and the atmospheric pressure, entering the cylinder 111 through ports 133, 132, and bellows 110 through ports 139 covered by a resilient non-return valve 143, restores the throttle valve to its initial position determined by the accelerator pedal. To enable the bellows 110 to be collapsed rapidly by suction but re-expanded slowly by the atmospheric pressure, a constriction may be provided in pipe 64 with a by-pass there around containing a non-return valve preventing flow therethrough into the bellows. In a modification the clutch is operated hydraulically under the control of a valve actuated by the suction in pipe 62 and the throttle opening and closing operations during gear changing may be performed hydraulically instead of by suction. Specification 812,350 [Group XXIV] also is referred to.